Rear portion of a motor vehicle



FIG. 1 is a perspective view of a rear portion of a motor vehicle showing our new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a left side elevational view thereof; and,

FIG. 4 is a top plan view thereof.

The portion of the motor vehicle shown in broken lines is for illustrative purpose only and forms no part of the claimed design. 

The ornamental design for a rear portion of a motor vehicle, as shown and described. 